JPH0468492U

JPH0468492U -

Info

Publication number: JPH0468492U
Application number: JP10936990U
Authority: JP
Priority date: 1990-10-20
Filing date: 1990-10-20
Publication date: 1992-06-17

Description

[Brief explanation of the drawing]

第１図は第１、第２の本考案それぞれの１実施
例を示す回路図、第２図は本考案者の先行技術の
点火用電力変換回路（点火回路）を示す回路図、
第３図〜第７図それぞれは第１、第２の本考案そ
れぞれの１実施例を示す回路図、である。符号の説明、１……ＤＣ−ＤＣコンバータ回路
、２〜３，６９……電源コンデンサ、４２……シ
ールド・ケース、４３，４８……点火コイル、４
３ａ……１次コイル、４４……点火用放電ギヤツ
プ、ｔ１〜ｔ７……入力端子。 FIG. 1 is a circuit diagram showing one embodiment of each of the first and second inventions, FIG. 2 is a circuit diagram showing an ignition power conversion circuit (ignition circuit) of the inventor's prior art,
FIGS. 3 to 7 are circuit diagrams showing one embodiment of each of the first and second present inventions. Explanation of symbols, 1... DC-DC converter circuit, 2 to 3, 69... Power supply capacitor, 42... Shield case, 43, 48... Ignition coil, 4
3a...Primary coil, 44...Discharge gap for ignition, t1-t7...Input terminal.

Claims

[Claims for Utility Model Registration] (1) A second switching means is connected to a control terminal of the first switching means having a self-turn-off function, and the two switching means are connected so that the constant voltage means is sandwiched between them. On-signal output means is connected in series between both power supply terminals of the DC power source and outputs an on-signal to the first switching means, and the inductance means and the load connected directly or equivalently in series are connected to the first switching means. and capacitance means, these are connected in series between the two power supply terminals, and one non-controllable switch is provided for each of the series circuit of the first switching means, the load and the inductance means, and the capacitance means. In a power conversion circuit provided with a control means connected in parallel in a direction opposite to the power supply voltage and controlling on/off of the second switching means based on the direction of current flowing through the inductance means, the first switching means 1. A power conversion circuit comprising: on-signal input blocking means for blocking the on-signal from being input to the first switching means when the main current becomes smaller than a predetermined value. (2) The power conversion circuit according to claim 1, wherein an ignition coil is used as the inductance means, and an ignition discharge gap is used as the load. (3) A second switching means is connected to the control terminal of the first switching means having a self-turn-off function, and the two switching means are connected between both power supply terminals of the DC power supply so that the constant voltage means is sandwiched between the two switching means. On-signal output means is connected in series and outputs an on-signal to the first switching means, and the inductance means and the load connected directly or equivalently in series are sandwiched between the first switching means and the capacitance means. are connected in series between the two power supply terminals, and the power conversion circuit is provided with a control means for controlling on/off of the second switching means based on the direction of the current flowing through the inductance means, the first switching means A power conversion circuit characterized in that a switching speed reduction means is provided for slowing down the switching speed of the power converter circuit. (4) A power conversion circuit according to claim 3, characterized in that a capacitor is connected between the main terminal forming a pair with the control terminal and the control terminal for inputting a drive signal to the first switching means. (5) The power conversion circuit according to claim 3 or 4, wherein an ignition coil is used as the inductance means, and an ignition discharge gap is used as the load.